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Associazione EURATOM ENEA sulla FUSIONE CONSEN A COMPUTER PROGRAM FOR TRANSIENT SIMULATION OF ENERGY AND MASS TRANSFER BETWEEN INTERCONNECTED VOLUMES DEVELOPED.

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Presentation on theme: "Associazione EURATOM ENEA sulla FUSIONE CONSEN A COMPUTER PROGRAM FOR TRANSIENT SIMULATION OF ENERGY AND MASS TRANSFER BETWEEN INTERCONNECTED VOLUMES DEVELOPED."— Presentation transcript:

1 Associazione EURATOM ENEA sulla FUSIONE CONSEN A COMPUTER PROGRAM FOR TRANSIENT SIMULATION OF ENERGY AND MASS TRANSFER BETWEEN INTERCONNECTED VOLUMES DEVELOPED FOR A PERSONAL COMPUTER A CENTRAL VOLUME plus N VOLUMES CONNECTED MULTI-FLUIDS SIMULATION CRYOGENIC CONDITIONS ICE FORMATION INTERNAL AND BOUNDARY STRUCTURES JUNCTIONS AND VALVES FIXED CONDITIONS VOLUMES INTERNAL AND EXTERNAL HEAT TRANSFER RADIATION BETWEEN STRUCTURES CRITICAL FLOW CHEMICAL REACTIONS AUTOMATIC TIME STEP CONTROL ON-LINE INFORMATION DURING CALCULATIONS

2 Associazione EURATOM ENEA sulla FUSIONE 2 LIQUID VAPOUR/GAS STRUCTURE FLOW RATE HEAT FIXED CONDITION VOLUME interfacial mass exchange flashing volume i from volume i-1 to volume i+1 WATER ( K) HELIUM ( K) OXYGEN (T > 54.4 K) NITROGEN (T > 0.1 K) HYDROGEN (GAS) AIR OTHER GAS NATURAL CONVECTION BOILING CONSENSATION JET IMPINGEMENT HEAT TRANSFER ICE FORMATION DIFFUSION AT THE LIQUID/ATMOSPHERE INTERFACE USER DEFINED HTC

3 Associazione EURATOM ENEA sulla FUSIONE 3 JUNCTIONS SIMULATION SIMPLE CONNECTION, VALVE OR BREAK SIMULATION FLOW AREA vs TIME FLOW RATE vs TIME or p ACTUATION TIME ACTUATION P OR T CHECK VALVE P COEFFICIENT vs TIME CRITICAL FLOW GAS HIGH SUBCOOLING FLASHING (LOW SUB.) TWO PHASE (H.M.) STRUCTURES SIMULATION FINITE DIFF. IMPLICIT METHOD (FOURIER EQ. 1-D, 2_D for target) INTERNAL POWER SOURCE DIFFERENT GEOMETRY: SLAB, CYLINDER, SPHERE MULTILAYER STRUCTURES INTERNAL STRUCTURES BOUNDARY STRUCTURES STRUCTURE MATERIALS CONCRETE CARBON STEEL STAINLESS STEEL COPPER GRAPHITE BERYLLIUM TUNGSTEN INSULANTS SUPERCONDUCTORS INPUT DEFINED MATERIALS BERYLLIUM-STEAM BERYLLIUM-AIR GRAPHITE-STEAM GRAPHITE-AIR TUNGSTEN-STEAM TUNGSTEN-AIR CHEMICAL REACTIONS

4 Associazione EURATOM ENEA sulla FUSIONE 4 NODALIZATION - The version 5.0 has been developed to allow the model of several compartments connected according to a free topology defined by the user, so that all the compartments can be connected, through junctions, to all the other volumes. CONSEN v 5.0 This overcomes the limitation of the previous versions of the code in which a maximum of six volumes could be connected only to a "central" compartment. CONSEN 5 nodalization example

5 Associazione EURATOM ENEA sulla FUSIONE 5 TRITIUM - A simple model to evaluate tritium migration between the compartments has been implemented too in CONSEN 5.0. The tritium flow between two connected volumes is evaluated multiplying the tritium volumetric concentration in the compartment (assumed uniform only in the atmosphere region) and the volumetric flow rate evaluated by the existing models in CONSEN. ICE - A model to evaluate ice porosity during formation and its influence on density and thermal conductivity has been implemented. Some modification in the iterative algorithms for the ice thickness evaluation has been introduced. In CONSEN all the tritium is considered in HTO form diluted in the steam and in the atmosphere. It is treated,at the present, as a gas (it does not condense on cold surfaces).


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